| Abbreviation | Definition |
|---|---|
| HOBY | Hugh O'Brian Youth |
| HOLY | Help Our Lutheran Youth |
| HONEY | Honor Our New Ethnic Youth |
| HOY | Helping Our Youth |
| HOYA | Helping Our Youth Achieve |
| HREF | Hello Red Evil Fire |
| HRIDAY | Health Related Information Dissemination Amongst Youth |
| HRY | High Risk Youth |
| HRYB | Herndon Reston Youth Baseball |
| HSY | Humane Society Youth |
| HSYA | High Sheriff Youth Awards |
| HSYAT | High School Youth Action Team |
| HSYC | Hindu Sabah Youth Council |
| HUNGRY | Hillside United New Generation of Radical Youth |
| HUYOE | Hold Up Your Own End |
| HVYHS | Hutt Valley Youth Health Service (New Zealand) |
| HWYO | Haringey Warriors Youth Organisation |
| HY | Highlands Youth |
| HY | Hitler Youth |
| HYA | Hamilton Youth Athletics |